An Integrated 802.11a Baseband and MAC ProcessorAn 0.25pm CMOS mixed-signal baseband and MAC processor for the IEEE 802.11a WLAN standard in 0.25~m CMOS occupies 6.8~6.8"~ and contains 4.OM transistors in a 196-pin BGA package. Power consumption for transmit and receive is 326mW and 452mW. Additional data rates up to 108Mb/s are supported. J. S. Thomson---e

The proposed model, based on extensive biomechanical experiments, can be used for accurate simulation of arterial deformation and haptic rendering in surgical simulation. The resultant model enables stress relaxation status to be determined when subjected to different strain levels.

This paper presents a bit-plane coding algorithm for Laplacian distributed sources that are commonly encountered in signal compression applications. By exploiting the statistical characteristics of the sources, the proposed algorithm achieves a rate-distortion performance that is essentially comparable to an optimal non-scalable scalar quantizer, while at the same time operates at a complexity level suitable for most practical implementations.

Continuous-time bandpass (BP) sigma-delta modulators (61Ms) employing surface acoustic wave (SAW) resonators as loop filters are presented. Compared with the loop filters realized with -and LC resonators, the SAW resonator has the advantage of high-factor, wide resonant frequency range and accurate resonant frequency without the need for automatic tuning. With the proposed anti-resonance cancellation and loop filter phase compensation techniques, a second-and a fourth-order BP 61Ms are demonstrated in a 0.35-m CMOS technology. Both modulators are tested with 47.3-MHz off-chip SAW resonators. The second-order modulator attains a dynamic range of 57 dB and peak signal-to-noise distortion ratio (SNDR) of 54 dB and the fourth-order one achieves a dynamic range of 69 dB and peak SNDR of 66 dB, both in a 200-kHz signal bandwidth. The fourth-order modulator is also measured in a 3.84-MHz signal bandwidth and achieves a dynamic range of 52.5 dB and peak SNDR of 50 dB, an effective 8-bit resolution.Index Terms-Analog-to-digital converter (ADC), sigma-delta modulator (61M), bandpass (BP), surface acoustic wave (SAW) resonator.

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